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United States Patent | 5,731,861 |
Hatano ,   et al. | March 24, 1998 |
A composite material includes a cholesteric liquid crystal; a polymer which is distributed in phase-separated domains and provides an effective form-retention property for the composite material; and an additional material which is dissolved in the cholesteric liquid crystal and maintains a cholesteric phase of the liquid crystal and bistability of a focal conic state and a planar state of the liquid crystal.
Inventors: | Hatano; Takuji (Suita, JP); Hashimoto; Kiyofumi (Suita, JP); Kobayashi; Nobuyuki (Kobe, JP) |
Assignee: | Minolta Co., Ltd. (Osaka, JP) |
Appl. No.: | 640585 |
Filed: | May 1, 1996 |
May 02, 1995[JP] | 7-108659 |
Current U.S. Class: | 349/169; 252/299.01; 349/86; 349/175; 349/176; 349/185 |
Intern'l Class: | G02F 001/137 |
Field of Search: | 349/86,88,169,175,176,183,185,188 428/1 430/20 252/229.01,299.5,299.7 |
5200845 | Apr., 1993 | Crooker et al. | 349/175. |
5251048 | Oct., 1993 | Doane et al. | 349/88. |
5437811 | Aug., 1995 | Doane et al. | 252/299. |
5493430 | Feb., 1996 | Lu et al. | 349/185. |
5570216 | Oct., 1996 | Lu et al. | 349/175. |
5661533 | Aug., 1997 | Wu et al. | 349/169. |
D.K. Yang et al., "Chloesteric Reflective Display: Drive Scheme and Contrast", Appl. Phys. Lett 64(15), Apr. 11, 1994, pp. 1905-1907. |